ALL BALL NERVE CENTER — There’s a scene in the recent movie The Wolf of Wall Street where Matthew McConaughey welcomes Leonardo DiCaprio to his first job on Wall Street by asking Leo to join him in a tribal chant right there at the lunch table in a nice restaurant. It’s a chant probably more fitting for a sports venue, so the Dallas Mavericks have put together their own version and hashtagged it “#MAVSCHANT,” and asked fans to record and share their own versions.